由百欣科技研发的单FM车载手机免提是通过用产品上面的3.5耳机插线与手机相联， [1] 这样保证了音量能让司机听得更清楚。说话时声音是从产品上的麦里说出去的。
介绍了车载手机免提通过有线方式的实现，分别给出了采用LM386和TDA2822M有线收发系统的硬件电路和调试方法，提出了抗干扰措施。
The hardware circuits and the debug methods based on LM386 and TDA2822M are given, and the anti-jamming methods are also given.
当今随着汽车的日益普及，人们在驾驶中使用手机免提的需求也日益增强，但是绝大多数手机并不具备免提功能，因此开发一套车载手机免提系统非常有意义。
With the popularization of cars, there is a great demand for car telephones. But most mobile telephones don't have the function of off-hook, so it's very meaningful to develop a kind of car telephone.
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